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Check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

try connecting tv to cable direct also try unplugging both converter and tv for wile like 5 mins plug both back in see if tv and converter sync, but if otherwise then The ysus board is the most common reason. you can try websites on ebay.com to buy parts for replacement...

Disconnect the Z sustain board ribbon cables that go to the display and clean them with a small amount of acetone, ( nail polish remover ). ONLY THE COPPER TIPS ON THE RIBBON.....NOT THE RIBBON. Put those back in and do the same with the Y.
Z on the right Y on the left..

I had this same exact issue yesterday. I own the same TV model and here is what SONY had me do to get the picture back. Ultimately the picture comes back, but it will be very dim and needs repair. Most likely a power supply issue. Try these steps:

-Press power off or leave with standby light on for 5 minutes (wait the full 5 minutes)-Unplug TV / Press top buttons 5 times each to remove static from system boards (yes, each button 5 times each)-Wait one full minute and plug TV in and press power on

I had this same exact issue yesterday. I own the same TV model and here is what SONY had me do to get the picture back. Ultimately the picture comes back, but it will be very dim and needs repair. Most likely a power supply issue. Try these steps:

-Press power off or leave with standby light on for 5 minutes (wait the full 5 minutes)-Unplug TV / Press top buttons 5 times each to remove static from system boards (yes, each button 5 times each)-Wait one full minute and plug TV in and press power on

If the set is no longer under warranty, open up the back and reseat all of the connectors and cables. You are seeing a heat related connection problem. If it is still in warranty, bring it in for warranty repair. The other possibility is a heat related connection at the processing chip(s). This is a more complicated repair that should only be done by an experienced tech that works with surface mounted components.
Keep us posted.
Dan